For religious Sikhs their biggest influences would be the guru's and the Guru Granth Sahib and they hold high respect for the Granthi's and the elders because they are usually wiser.
For non-religious Sikhs it is usually the same as above, but they are also influenced by celebrities and TV
Sikhs have gurudawaras
Sikhs is not real
Since the meetings are of Sikhs, so usually Sikhs are present there.
Sikhs join the Khalsa.
Yes Sikhs have weddings.
Sikhs wear a kara, kirpan, kaccha, kanga, and kesh to show that they are Sikhs and that they are proud.
The Gurudwara is a place of worship for Sikhs.
Yes, there are about 500,000 Sikhs in the UK
Sikhs only cremate.
The holy book of Sikhs is Gurugranth Saheb.
Sikhs are individuals like everybody else. Some has allergies and others don't. There are no allergies specific to all Sikhs.
Many Sikhs I am one of them